Patent GB-767256-A (GB)
Title: Improvements in carburetors including an auxiliary starting carburetor
Inventor: MENNESSON ANDRE LOUIS
IPC: F02M1/04
Filed: 1955-03-29
Abstract: 767,256. Carburetters. SOLEX. March 29, 1955 [April 5, 1954], No. 9164/55. Class 7 (3). In a carburetter including an auxiliary starting carburetter the control valve member of which is capable of controlling the supply of fuel through the auxiliary starting carburetter and of directing the fuel air mixture from the starting carburetter towards a point of the induction pipe located downstream of the throttle valve and also including means interposed between the control valve member and the throttle valve so that the throttle valve is partly opened when the control valve memoer is opened that is to say brought into a position in which it supplies fuel through the auxiliary starting carburetter the means are so arranged that when the control valve member is opened and the throttle valve partly opened the control valve member can be closed back without the throttle valve returning to its maximum closing position as long as the throttle valve has not been temporarily moved in the opening direction. The auxiliary starting carburetter control valve may be manually operated. As shown it is controlled by the bimetallic strip 22. With the parts in the position shown in Fig. 1 if the engine is cold friction between members 36, 38 prevents the auxiliary carburetter control valve from being operated by its bimetallic strip. If the operator then temporarily operates the throttle valve a plate 42 acts upon a projection 40 and causes the lever 38 to release member 36 and thus the lever 31. The bimetallic strip 22 can then act on the control valve member 11 and bring it into the position shown in Fig. 3. When the throttle valve is released the lever 38 again engages the member 36 and the throttle cannot return to the idling position. As the engine warms up the control valve 11 can freely turn in the closing direction but the lever 31 remains in position due to co-operation of the member 36 and lever 38. If throttle is depressed the lever 31 is released and assumes a position corresponding to the control valve 11 and the throttle when released comes into a corresponding position. The lever 38 can move freely on the throttle valve shaft 27 between positions determined by projections 39, 40. In one position projection 39 is in contact with the adjustable screw 41 and in the other the projection 40 the plate 42 which is fixed with respect to the shaft 27. An abutment 44 co-operates with the projection 39 and limits the idle position of the throttle valve and this idle position can be adjusted by means of the screw 41. The same abutment 44 co-operating with the lever 38 can limit the displacement of the lever 38 in the other direction and therefore owing to the provision of the plate 42 and projection 40 can limit the displacement of the throttle valve in the opening direction. If the throttle valve is fully opened the plate 42 keeps the arm 45 of the lever 31 in position and therefore prevents the control valve member 11 from opening. The passage 14 leading from the control valve 11 is under control of a suction operated piston 17 and this piston also controls the end of a conduit 20 which is closed when the suction is above a predetermined value. When the end of the conduit 20 is closed passage 15 is still connected to this conduit through a small section orifice 21. The auxiliary carburetter includes a calibrated passage 7 and holes at the end and in the side of the tube 8. A stream of air or gas may be circulated through the housing 26 of the strip 22.